#11115: Rewrite cached_method in Cython
--------------------------------------------+-------------------------------
Reporter: SimonKing | Owner: jason
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-4.7.2
Component: misc | Keywords: category cython
cache
Work_issues: Pickling of cached functions | Upstream: N/A
Reviewer: | Author: Simon King
Merged: | Dependencies: sage-4.7, #9976,
#11298, #11342
--------------------------------------------+-------------------------------
Changes (by SimonKing):
* status: needs_review => needs_work
* work_issues: => Pickling of cached functions
Comment:
I'd like to add one functionality: Pickling of cached functions!
Cached methods can be pickled. However, cached functions can not. Without
my patch (in sage-4.6.2):
{{{
sage: from sage.databases.cunningham_tables import
cunningham_prime_factors
sage: loads(dumps(cunningham_prime_factors))
---------------------------------------------------------------------------
PicklingError Traceback (most recent call
last)
/home/king/SAGE/work/categories/objects/<ipython console> in <module>()
/mnt/local/king/SAGE/broken/local/lib/python2.6/site-
packages/sage/structure/sage_object.so in sage.structure.sage_object.dumps
(sage/structure/sage_object.c:8348)()
PicklingError: Can't pickle <type 'function'>: attribute lookup
__builtin__.function failed
}}}
With my patch:
{{{
sage: loads(dumps(cunningham_prime_factors))
Cached version of None
}}}
The last one is a bit grotesque... Anyway, I think it should be easy to
add a an unpickling function that recovers a cached method from its name
and module.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11115#comment:66>
Sage <http://www.sagemath.org>
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